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Article Dans Une Revue Physical Review Letters Année : 2022

Fractional Entropy of Multichannel Kondo Systems from Conductance-Charge Relations

Cheolhee Han
  • Fonction : Auteur
Andrew K Mitchell
  • Fonction : Auteur
Yaakov Kleeorin
  • Fonction : Auteur
Anne Anthore
Yigal Meir
  • Fonction : Auteur
Eran Sela

Résumé

Fractional entropy is a signature of nonlocal degrees of freedom, such as Majorana zero modes or more exotic non-Abelian anyons. Although direct experimental measurements remain challenging, Maxwell relations provide an indirect route to the entropy through charge measurements. Here we consider multichannel charge-Kondo systems, which are predicted to host exotic quasiparticles due to a frustration of Kondo screening at low temperatures. In the absence of experimental data for the charge occupation, we derive relations connecting the latter to the conductance, for which experimental results have recently been obtained. Our analysis indicates that Majorana and Fibonacci anyon quasiparticles are well developed in existing two- and three-channel charge-Kondo devices, and that their characteristic $k_{\rm{B}}\log \sqrt{2}$ and$k_{\rm{B}}\log \frac{1+\sqrt{5}}{2}$ entropies are experimentally measurable.
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Dates et versions

hal-03432279 , version 1 (17-11-2021)

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Cheolhee Han, Andrew K Mitchell, Zubair Iftikhar, Yaakov Kleeorin, Anne Anthore, et al.. Fractional Entropy of Multichannel Kondo Systems from Conductance-Charge Relations. Physical Review Letters, 2022, ⟨10.1103/PhysRevLett.128.146803⟩. ⟨hal-03432279⟩
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